/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

/**
 * @author Alexander Y. Kleymenov
 */

package org.apache.harmony.security.x509;

import java.io.IOException;

import org.apache.harmony.security.asn1.ASN1BitString;
import org.apache.harmony.security.asn1.BerInputStream;
import org.apache.harmony.security.asn1.BerOutputStream;

/**
 * The class encapsulates the ASN.1 DER encoding/decoding work with the
 * following part of X.509 CRL (as specified in RFC 3280 - Internet X.509 Public
 * Key Infrastructure. Certificate and Certificate Revocation List (CRL)
 * Profile. http://www.ietf.org/rfc/rfc3280.txt):
 * 
 * <pre>
 *  ReasonFlags ::= BIT STRING {
 *        unused                  (0),
 *        keyCompromise           (1),
 *        cACompromise            (2),
 *        affiliationChanged      (3),
 *        superseded              (4),
 *        cessationOfOperation    (5),
 *        certificateHold         (6),
 *        privilegeWithdrawn      (7),
 *        aACompromise            (8) 
 *  }
 * </pre>
 */
public class ReasonFlags {

	/**
	 * The names of the reasons.
	 */
	static final String[] REASONS = { "unused", //$NON-NLS-1$
			"keyCompromise", //$NON-NLS-1$
			"cACompromise", //$NON-NLS-1$
			"affiliationChanged", //$NON-NLS-1$
			"superseded", //$NON-NLS-1$
			"cessationOfOperation", //$NON-NLS-1$
			"certificateHold", //$NON-NLS-1$
			"privilegeWithdrawn", //$NON-NLS-1$
			"aACompromise" //$NON-NLS-1$
	};

	// the value of extension
	private final boolean[] flags;

	/**
	 * ASN.1 Encoder/Decoder.
	 */
	public static final ASN1BitString ASN1 = new ASN1BitString.ASN1NamedBitList(
			REASONS.length) {
		@Override
		public Object getDecodedObject(BerInputStream in) throws IOException {
			return new ReasonFlags((boolean[]) super.getDecodedObject(in));
		}

		@Override
		public void setEncodingContent(BerOutputStream out) {
			out.content = ((ReasonFlags) out.content).flags;
			super.setEncodingContent(out);
		}
	};

	/**
	 * Creates the extension object corresponding to the given flags.
	 */
	public ReasonFlags(boolean[] flags) {
		this.flags = flags;
	}

	/**
	 * Places the string representation of extension value into the StringBuffer
	 * object.
	 */
	public void dumpValue(StringBuffer buffer, String prefix) {
		buffer.append(prefix);
		buffer.append("ReasonFlags [\n"); //$NON-NLS-1$
		for (int i = 0; i < flags.length; i++) {
			if (flags[i]) {
				buffer.append(prefix).append("  ") //$NON-NLS-1$
						.append(REASONS[i]).append('\n');
			}
		}
		buffer.append(prefix);
		buffer.append("]\n"); //$NON-NLS-1$
	}
}
